[LLVMbugs] [Bug 623] NEW: request for -malloc2alloca optimization pass

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=623

           Summary: request for -malloc2alloca optimization pass
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: opt
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: eric at vanrietpaap.nl


If such an optimization pass would do escape analysis pypy-llvm might be able to
use a lot less malloc. These are currently in pypy-llvm costly becausewe use the
Boehm garbage collector that obviously need to do more that a normal malloc and
free.

Because the actual Boehm malloc is called GC_malloc this would need to be an
alias of malloc. In general it would be nice to be able tell the optimizers
about aliases of known functions (could that be useful for simplify-libcalls
translations, just guessing here). Or maybe this is already possible by
implementing an internal malloc in the .ll file. Not sure here, will have to try
that later.

[If part two makes sence then this enhancement request should have been split]



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